//1,d为null,undefined
var d = "shen";
d = d || ",";
console.log(d);

//2,c为字符串或数值
var c = 'abc';
console.log(Math.abs(c));
c = Math.abs(c) + 1 ? c : 2;
console.log(c);

var objTF = {
	name:'腾飞',
	age:20,
	city:"上海"
}
